气态中性基态原子的原子核外电子排布发生如下变化,吸收能量最多的是
A:1s22s22p63s23p2→1s22s22p63s23p1
B:1s22s22p63s23p3→1s22s22p63s23p2
C:1s22s22p63s23p4→1s22s22p63s23p3
D:1s22s22p63s23p64s24p2→1s22s22p63s23p64s24p1
下列阶层中,属于夏商西周国家的统治阶层的有( )①天子 ②诸侯 ③卿大夫 ④士 ⑤平民 ⑥奴隶
阅读短文,回答问题。
It's eight o'clock. The children go to school by car every day. But they are walking to school today. It's ten o'clock. Mrs. Green usually(通常) stays at home in the morning. But she is going to the shops this morning. It's nine o'clock. Mr. Green usually reads his newspaper at night(晚上). But he is reading an interesting(有趣的) book this evening.